[PATCH] dump when SLP analysis fails due to shared vectype mismatch

[Richard Biener]

This adds another one.

Bootstrapped / tested on x86_64-unknown-linux-gnu, pushed.

2020-10-28  Richard Biener  <rguent...@suse.de>

        * tree-vect-slp.c (vect_slp_analyze_node_operations_1): Dump
        when shared vectype update fails.
---
 gcc/tree-vect-slp.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/gcc/tree-vect-slp.c b/gcc/tree-vect-slp.c
index c98f747d4a9..ff3a0c2fd8e 100644
--- a/gcc/tree-vect-slp.c
+++ b/gcc/tree-vect-slp.c
@@ -3371,7 +3371,13 @@ vect_slp_analyze_node_operations_1 (vec_info *vinfo, 
slp_tree node,
 
   if (is_a <bb_vec_info> (vinfo)
       && !vect_update_shared_vectype (stmt_info, SLP_TREE_VECTYPE (node)))
-    return false;
+    {
+      if (dump_enabled_p ())
+       dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
+                        "desired vector type conflicts with earlier one "
+                        "for %G", stmt_info->stmt);
+      return false;
+    }
 
   bool dummy;
   return vect_analyze_stmt (vinfo, stmt_info, &dummy,
-- 
2.26.2